【官方教程】Cocos2d-x xml解析

原创: zeroyang

Cocos2d-x 已经加入了tinyxml2用于xml的解析。3.0版本位于external/tinyxml2下。2.x版本位于cocos2dx/support/tinyxml2下。

tinyxml2 Github地址:https://github.com/leethomason/tinyxml2

帮助文档地址:http://grinninglizard.com/tinyxml2docs/index.html

生成xml文档

  1. 引入头文件

    #include "tinyxml2/tinyxml2.h"
    using namespace tinyxml2;
    
  2. xml文档生成

    void  HelloWorld::makeXML(const char *fileName)
    {
    std::string filePath = FileUtils::getInstance()->getWritablePath() + fileName;
    XMLDocument *pDoc = new XMLDocument();
    //xml 声明(参数可选)
    XMLDeclaration *pDel = pDoc->NewDeclaration("xml version=\"1.0\" encoding=\"UTF-8\"");
    pDoc->LinkEndChild(pDel);
    //添加plist节点
    XMLElement *plistElement = pDoc->NewElement("plist");
    plistElement->SetAttribute("version", "1.0");
    pDoc->LinkEndChild(plistElement);
    XMLComment *commentElement = pDoc->NewComment("this is xml comment");
    plistElement->LinkEndChild(commentElement);
    //添加dic节点
    XMLElement *dicElement = pDoc->NewElement("dic");
    plistElement->LinkEndChild(dicElement);
    //添加key节点
    XMLElement *keyElement = pDoc->NewElement("key");
    keyElement->LinkEndChild(pDoc->NewText("Text"));
    dicElement->LinkEndChild(keyElement);
    XMLElement *arrayElement = pDoc->NewElement("array");
    dicElement->LinkEndChild(arrayElement);
    for (int i = 0; i<3; i++) {
        XMLElement *elm = pDoc->NewElement("name");
        elm->LinkEndChild(pDoc->NewText("Cocos2d-x"));
        arrayElement->LinkEndChild(elm);
    }
    pDoc->SaveFile(filePath.c_str());
    pDoc->Print();
    delete pDoc;
    }
    
  3. 打印结果

    
    
    
    
        Text
        
            Cocos2d-x
            Cocos2d-x
            Cocos2d-x
        
    
    
    

上面代码使用tinyxml简单生成了一个xml文档。

解析xml

下面我们就来解析上面创建的xml文档

  1. 引入头文件

    #include "tinyxml2/tinyxml2.h"
    using namespace tinyxml2;
    
  2. xml解析

    void HelloWorld::parseXML(const char *fileName)
    {
    std::string filePath = FileUtils::getInstance()->getWritablePath() + fileName;
    XMLDocument *pDoc = new XMLDocument();
    XMLError errorId = pDoc->LoadFile(filePath.c_str());
    if (errorId != 0) {
        //xml格式错误
        return;
    }
    XMLElement *rootEle = pDoc->RootElement();
    //获取第一个节点属性
    const XMLAttribute *attribute = rootEle->FirstAttribute();
    //打印节点属性名和值
    log("attributename = %s,attributevalue = %s", attribute->Name(), attribute->Value());

    XMLElement *dicEle = rootEle->FirstChildElement("dic"); XMLElement *keyEle = dicEle->FirstChildElement("key"); if (keyEle) { log("keyEle Text= %s", keyEle->GetText()); } XMLElement *arrayEle = keyEle->NextSiblingElement(); XMLElement *childEle = arrayEle->FirstChildElement(); while ( childEle ) { log("childEle Text= %s", childEle->GetText()); childEle = childEle->NextSiblingElement(); } delete pDoc; }

    在节点解析过程中,注意对获取到的节点进行判空处理。

  3. 解析结果打印

    cocos2d: attribute_name = version,attribute_value = 1.0
    cocos2d: keyEle Text= Text
    cocos2d: childEle Text= Cocos2d-x
    cocos2d: childEle Text= Cocos2d-x
    cocos2d: childEle Text= Cocos2d-x

小结

上面的简单示例,演示了如何使用tinyxml进行xml文档生成和解析。更多详细的帮助请参考 tinyxml帮助文档http://grinninglizard.com/tinyxml2docs/index.html

标签: cocos2d-x教程

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